I saw this "He-Man sings 'what's going on'" video when it first came out and recently discovered it again. I was a huge He-Man fan when I was a kid. I enjoyed seeing my old friends Man-At-Arms and Skeletor. The over-dubbing and editing is masterfully done. Love the IM chatting between He-Man and Man-At-Arms and Skeletor's entrance.
If you get really nostalgic you might enjoy watching the intro:
I can't believe I actually watched that show.